func ensureSystemSSHKey(context Context) error {
identityFile := context.AgentConfig().SystemIdentityPath()
// Don't generate a key unless we have to.
keyExists, err := systemKeyExists(identityFile)
if err != nil {
return fmt.Errorf("failed to check system key exists: %v", err)
}
if keyExists {
return nil
}
privateKey, publicKey, err := ssh.GenerateKey(config.JujuSystemKey)
if err != nil {
return fmt.Errorf("failed to create system key: %v", err)
}
// Write new authorised key.
keyManager := keymanager.NewClient(context.APIState())
errResults, err := keyManager.AddKeys(config.JujuSystemKey, publicKey)
apiErr := err
if apiErr == nil {
apiErr = errResults[0].Error
}
if err != nil || errResults[0].Error != nil {
return fmt.Errorf("failed to update authoised keys with new system key: %v", apiErr)
}
return ioutil.WriteFile(identityFile, []byte(privateKey), 0600)
}
func generatePrivateKey(c *gc.C) string {
oldBits := ssh.KeyBits
defer func() {
ssh.KeyBits = oldBits
}()
ssh.KeyBits = 32
private, _, err := ssh.GenerateKey("test-client")
c.Assert(err, gc.IsNil)
return private
}
// GenerateSystemSSHKey creates a new key for the system identity. The
// authorized_keys in the environment config is updated to include the public
// key for the generated key.
func GenerateSystemSSHKey(env environs.Environ) (privateKey string, err error) {
logger.Debugf("generate a system ssh key")
// Create a new system ssh key and add that to the authorized keys.
privateKey, publicKey, err := ssh.GenerateKey(config.JujuSystemKey)
if err != nil {
return "", fmt.Errorf("failed to create system key: %v", err)
}
authorized_keys := config.ConcatAuthKeys(env.Config().AuthorizedKeys(), publicKey)
newConfig, err := env.Config().Apply(map[string]interface{}{
config.AuthKeysConfig: authorized_keys,
})
if err != nil {
return "", fmt.Errorf("failed to create new config: %v", err)
}
if err = env.SetConfig(newConfig); err != nil {
return "", fmt.Errorf("failed to set new config: %v", err)
}
return privateKey, nil
}